When I try to download Adobe Connect Add-in, message tells me I haven't enuf room on hard-disk, yet I've plenty hard-drive space available.
You could either download the latest version of the Add-In with a standalone installer at http://www.adobe.com/support/connect/downloads-updates.html
Or you could also try using IE/Firefox/Safari when downloading the addin. Google Chrome is known to give issues while downloading the Add-In sometimes.
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Could you please provide the screen shot of the error you were getting while downloading the adobeconnect Add-in.
Also make sure you have all required privileges on the machine where you were installing the addin.